c_g_socket_send_to

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
gssize function(GSocket* socket, GSocketAddress* address, gchar* buffer, gsize size, GCancellable* cancellable, GError** error) c_g_socket_send_to;

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